Collapsible mold for concrete structures



' H.- 1. KESTLER. COLLAPSIBLE M010 FOR CONCRET'E STRUCTURES.

` A'PPLICATION FILED DECZZ, 1920. '"1 E A21 956, Patented July 4, 1922.,

3 SHEETS-SHEET l.

HEEMAN (j /t/Es n. E@

WITNESS/5S A TTOR/l/EYS H. J. KESTLER.

COLLAPSTBLE MOLD FOR CONCRETE STRUCTURES.

21. QL. 92 1T. .9H 4H S MR JH dw nnb-v3 Lnbv, n@ D... 0. 2 9 2 2 rw E D D H :ll N 0 .H A c U DI DI A e, n@ KU Od 2 l A, .ai

nl 5m. El d, if my ma m ,45 V.nl-llo n a M L 237// M/ 117 P.\\7J 7 5. m wz H. J. KESTLER.

COLLAPSIBLE MOLD FOR CONCRETE STRUCTURES.

APPLICATION FILED DEC-22. 1920.

Patented July 4, 1922.

3 SHEETS-SHEET 3.

HERLIAN J'. KESTLER, NEW YORK, N. Y.

Specification of Letters Patent.

Patented July 4, 1922.

Application filed December 22, 1920. Serial No. 432486.

To al? whom it may concern:

Be it known that I, HERMAN J. KESTLER, a citizen ofthe UnitedStates, and a resident of the city of New York, Fort Richmond, borough of Richmond, in the county of Richmond and State of New York, have invented a new and improved Collapsible Mold for Concrete Structures, of which the following is a description.

My invention relates to a mold for concrete structures and more particularly it relates to a mold for forming a structiu with double walls having a space or cavity extending with substantial continuity to run with the wall or around the several sides of al building structure. the said double wall thus referred to being distinguished from solid wall formed with separated holes giving the wall a cellular character. The method most practiced in forming walls with continuous sectionsof the double wall at the same time.

Thel invention has in viewv to provide a mold for forming walls with continuous cavities. improved in various particulars and having various characteristics which can best be stated in connection with the description of a specific embodiment and the variants thereof.

I would state here. however, that the invention provides a mold that may be assembled on the ground and then placed in position either vertically, for the forming of walls, or horizontally, for the forming of a double floor. Y v

An important feature also of my knockdown mold is that it embodies collapsible core units factoring to form the continuous cavity or cavities in the wall, said units being characterized by their clamping relation to positioned planks. the arrangement being such that the clamps and core units mutuallyv contribute'to sustain the mold set p up in assembled form in coaction with clamp las desired for Jositionino it for aourino the s l e wall or floor. The collapsing core units in addition to factoring in holding the mold 1n assembled lform in a manner to produce the intervening` space or spaces inthe wall are ofimportance in that they are essentially self--collapsing and at all events permit of collapsing being brought about with great `facility for the disassembling of the mold after the wall has been poured and become set.

.fin important feature also is the character of sockets provided to receive and alinethe opposed ends of adjacent planks, the sockets being formed of separable inner and outer members with their associated spacing means, the advantages of which will clearly appear as the description proceeds, there being corner socket elements comprising separable inner and outer sides and receiving bolts and theirappurtenances to coordinate the corner sockets and the associated collapsingv core units with the other sockets and core units along` the walls at intervals between the corners.

Reference is to be had to the accompanying drawings forming a part of this specification, it' being understood that the draw ings are merely illustrative of 'a practical example of the invention.

Figure 1 is a 'fragmentary perspective view showing a portion ofa mold and wall seetions` formed thereby;

Figure `2'is a horizontal section;

Figure 3 is a vertical section on the line 3-3, Figure 2; showing the collapsible core unit in posit-ion;

Figure 4l is a `vertical section on the line `lmet, Figure 2 Y Figure 5 is a longitudinal vertical section through the collapsible core elements showingthe same in collapsed form;

Figure 6 is a perspective view of one of the core elements;

Figure 7 is a perspective view of the mating core` element;

Figure S is a plan vview of the mold including the corner members thereof;

Figure 9 is a partly sectional side'elevation of mating core elements of modified form showing the samel collapsed;

Figure l0 is a fragment-ary perspective `view of the core elements shown in Figure 8 illustrating the same in expanded form;

Figure 1l is a partly sectional side elevation taken at right angles to Figure 10;

Figure 12 is a horizontal section on line Yl2--l2, Figure 9;

Figure 13 is a horizontal section on line 13-13, Figure 10. n

Referring more particularly to Figures 1 to 7 my improved mold includes two series of planks to constitute the inner and outer sides` of the respective mold sections for pouring' the inner and outer wall sections of the double wall, of any length or height the numeral 10 indicating the planks forming the sides of the inner mold section and the numeral 11 indicating the planks forming the walls. of the outer mold section.

The planks do not break joint, the joints ofthe respective layers of planks alining and I provide improved sockets for the opposed ends of the planks. The sockets are formed with separate inner and outer sides,

there being strips 12 voverlying the plank joints at the outer side and strips 17 torming ltheV inner sides oi' the sockets. Bolts 13 pass through the said socket sides 12 and 17 and receive nuts 14. rlhe joints are such as to permit expansion and contraction of the planks and contributing to this end the planks are formed with cut-outs 15 at the opposed ends at the bolts. Additional strips "12b corresponding with the strips 12 are emsections, washer strips 17aV corresponding with the sides 17 are provided against the sides of the interior planks 10,Y 11 or those planksfactoring in forming the cavity, said strips 17 a coacting with'collapsible coreunits Yhereinafter described tofform socketsv for the opposed ends of the said interior planks 10, 11. Spacing sleeves 18 are employed between the elements 17, 17 a of each mold section and remain in the poured wall. The elements 17, 17a minimize the entrance of Y cement to the end joints between ther planks Y and they permit expansion and contraction Sleeves 19 corresponding `generally with the sleeves 13 are employed on the bolts 13b remote from the plank joints, Y

of the planks.

said sleeves 19 being of a length to bear respectively at their ends against the planks 10, 10 and 11,11 instead of bearing against the elements 17, 17a.

My improved collapsible core units as best.

seen in Figures 5 to 7 are each composed ot an elongated element 21 and a coactingelement 22 forming the opposite sides ot the unit. Said elements may, as shown, consist of essentially flat strips. The one side (21) of the collapsible core unit is formed with a vertical series of oblongV holes 23 therein and the other'elongated element (22) thereol' when the core is expanded.

has formed thereon or secured thereto bevelled lugs 24 on the inner face thereof. The lugs 24 in the collapsed position of the core unit are accommodated in the corresponding openings 23 and lie substantially in the plane of the opposed element 21. On the other hand when the elements 21, 22Yare disposedbetween the interior planks 10, 11 for Said key 26 is accommodated in alined holes 25 in the elements 21, 22 adjacent Vto ends When it is desired to remove the core, the -key 26 is removed which permits the sides of the core to collapse. It is to be noted that in itorniing double walls it is theV practice to lay transverse reinforcingV elements that cross the intervening space between the inner and outer wall sections7 said reinforce elements being laid at the respective floors. Thus, when the core units are collapsed Vwith the withdrawal of their keys'26, the V cores may be readily removed. The adjacent interior planks 10, 11 can now Yreadily be ren moved. The planks cannot fall below the next lowermost transverse reinforce elements. y ings, etc., aiiord access to any of the planks falling to the transverse reinforce elements therebenea-th.

in' the form of the collapsing-core unit shown in Figures 9 to 13, Vthe elements'thereof are in the general form of channel bars, the one being partially or wholly receivable one within the other inthe collapsed Storm. The one element 21a has transverse rods or pinsA 23b adapted -to be engaged by bevelled integral lugs 24a onY the other' element so that the longitudinal movement ot the elements relatively to each other'will cause the rods 23"L tor-engage the Vbevelled The window openings, door open- Y,

surfaces of the lugs 2Ll-ft't'or expanding the unit. The respective elements havetransverse holes 25?, 251 to receive akey 26- tor holding the unit in expanded form. In both Forms ot the collapsiblecore or spacing unit,

the wedging lugs 24 or 211l ot the one ele- Y ment overlap and engage the other element.V

ample, referring toFigure 2, the bolts may,V 13'0 be passed through theouter elements 12, 12b,

and the nuts 14, 14h then applied outside of said elements. Next, the outermost or exterior planks 11 are applied and then the adjacent element 17 is appliedv to the bolt 13 and placed against the inner faces of the outermost planks 11; the outermost sleeve 18 will be then applied to the bolt, and next an element 17a so that said sleeve 18 is held between the outer elements 17, 17a of the outer mold section to determine the width of the wall section A, it being understood that planks of varying thickness may be employed and sleeves 18 of various lengths according to the width of the wall section. rlhe interior planks 11 of the outer mold section are applied against. the adjacent ele ment 17, and the collapsible core units, the sides of which are formed by the elements 21, 22 or 21a, 22a, are then placed in position andthe adjacent planks 10 pertaining to the inner mold section at the interior or cavity of the mold may be laid so that the collapsing core units lie between the interior planks of the respective mold sections. A second elements 17'Ll and a second sleeve 18 are placed on the bolt next that element 17 forming with theinner strip 12 the socketv for the planks 10 at the inner face of the mold, said last-mentioned strip 12 and the inner nut being finally placed in position.

lVith the tighteningl of the nuts 14 all the parts are held in clamped relation, the interposed collapsing units 21, 22 having been expanded by relative movement of said ele' ments to engage the bevelled lugs 24 with the walls of the openings 23. Thus, it will be seen that the units when expanded exert an outward pressure on the interior planks of both mold sections and the pressure is opposed by the nuts 14l or both head and nut to effect a firm and solid'clamping of the mold parts into a rigid unitary structure.

The keys 26 of the collapsing core units are removed permitting the cores to collapse or enabling the collapsing to be brought about by longitudinal movement of one element 21 relatively to the other element 22, (or relative movements of lelements 21a, 22a). lVith the removal of the nuts 14 and bolts, the respective planks may be successively removed as well as the strip 17, 17 a leaving the sleeves 18, 18a. 19 in position. With the mold as described it will be seen that in assembling and disassembling, the collapsing core units factor largely in clamping the parts in position and releasing the same for removal.

It will be readily understood that instead of a single cavity and therefore a single series of collapsing core units, a wall with two or more cavities may be produced, the illustrated example showing aI wall with only one cav-ity between a pair of wall sections.

T he construction ofthe mold at a corner embodies the essential elements' above described but modified to adapt them to the corner formation of the building structure, said corner elements being illustrated in Figure 8.

ln said Figure 8 the characters 10a, 11a, indicate planks corresponding with the planks 10, 11 and arranged in pairs to form a central space or cavity between the Wall sections. Angle elements are employed to form the sockets for the ends of the planks at the inner and outer faces of the mold. Thus, the outer angle is advantageously composite in practice, l being formed of channel bars 27, 28 disposed at the exterior of the mold, said channel bars being united at the corner as by bolts 29. Each element 27, 28 has a vertical angle piece 30 formed on or secured thereto, forming with the back of the adjacent channel bar a socket for the ends of the adjacent planks. The sockets formed by the members 30 and the channel bars 27, 28 are given a size to accommodate planks of varying thickness and filler blocks 30"L may be employed according to the thickness of the plank. The angle members 3() of the plank sockets offset the channel bars 27 28 forming the outermost side of they outer section of the mold at the corner so that said channel bars lie outward of the intersecting general planes of adjacent sides of the wall and thereby a pilaster effect may be produced. The dotted lines a, Figure 8, indicate the general planes of the wall and the material run outside of said lines forms the pilaster. Then a pilaster effect is not desired, thcspace within the channel bars 27, 28 is filled to the intersecting planes indicated by the dotted lines a. To coact with the outer angle structure represented-by the elements 27, 28 and 30 and in forming the outer section of the double wall, an inner angle piece 31 is provided at the corner against which the interior planks 11a of the outer` mold section are laid. The described collapsible core units composed of the elements 21, 22 or 21, 22a are placed at the inner side of the interior planks 10a, 11, the cores of a pair being slightly distant from the corner but within the angle piece 31 thus automatically squaring the mold. A. pair of bolts 13 corresponding with bolts 13 are employed at right angles adjacent to the corner and passing through the angle piece 31` planks 11a, and the angle 27, 28 as well as through the socket members 30, said bolts having the necessary complement of sleeves 18a.

1n the cornerconstruction the exterior elements 27, 28 correspond with a clamp strip 12 or 12, while the angle pieces 30 form the inner side of the exterior clamp socket adjacent the corner. The element 31, it will be observed, corresponds Vin function with outer element 17a. Additional corner angle pieces are provided for the molding of the inner Acorrespond with the outer sleeve 18 and the inner sleeves 18FL correspond with the inner` sleeve 18. The corner socket for those planks 10a at the inner surface of the mold are formed by anangle piece 3a corresponding with the second or inner socket strip 12 while the angle piece 32corresponds with the innermost strip or washer 17.

By means of separate socket sides or elements 1Q, 17, a socket very light in weight is produced and one involving theminimum cost of time, labor-,and material. The coacting and interdependent organism comprising the sockets, collapsing cores, planks and spacers serves to attain the important object of lproviding a collapsible mold which can be rapidly set up, easily taken down, and one that may be used over and over again, and the important desideratum is attained that the mold isV characterizedl by extremo simplicity and few elements outside of the plank. Thus, the mold may be made up wholly or very largely of standard elements -ready to be completed by use of ordinary sitioning of its successive layers of planks Vmakes the mold at the corner selt-squaring and self-plumbing. Y

l would state in conclusion that while the illustrated examples constitute practical embodiments of thev invention, I do not limit myself strictly to the exact details-herein illustrated, since manifestly the same can be considerablyv varied without departure from the spirit of the inventionas defined in the annended claims.

Having thus described my invention, l

Aclaim 1. A mold for double walls comprising separated inner and outer mold sections each' having spaced planks forming Athe exterior and the interior sides of the respective mold sections, sockets for the ends of the exterior planks, transverse clamp elements extent.-

Vingthrough bothmold sections kat said sockets, members positioned at the joints of the interior'planks of each mold section and lyingagainst the inner surfaces of saidinterior planks, spacing means in the respective mold sections between theV respective sides thereof and expansible, cores between the mold sections to vpress the interior planks against said members, and hold the two mold sections rigidly together as a unitary structure. f Y Y 2. A. mold for double walls comprising separated inner and outer mold sections each having' spaced planks forming the exterior and the interior sides of the respective mold sections, sockets for the ends of the exterior planks, transverse clamp elements extending through both mold sections at said sockets. members positioned at the joints of the interior planks of each mold section and lying against'the inner surfaces of said interior planks and lexpansible cores between the mold sections to press the interior planks against said members, and hold the two mold sectionsrigidly together as la unitary structure; together with spacing means on said transverse clamp elements between the sockets of the exteriorplanks and the members Vcollapsinfcii core unit for use between the inner and outer molding' means for molding double walls to hold said means spaced, said unit comprisingelongated elements, the one element having a series of openings therein and the other element having a corresponding series of bevelled .lugs adapted'to enter saidopenings when the cores collapse and adapted to engage the other element at said openings by a' relativelongitudinal movementof-said elements for expanding the unit. Y Y

et. As anew article of manufacture, a collapsing` core `unit for use between the Yinner and outer molding lmeans of double walls for holding said'means spaced, said unit comprising` elongated elements, the one element having a series of openings therein and the other'element having a corresponding series of bevelledlugs adapted to enter Vsaid openings when the core collapses and adapted to engage the other element at said openings by a relative longitudinal movement of said' elements for expandingl the core; together with' a ykey to lock saidY elements in expanded relation, said elements having alined holes to receive said key when thecore is expanded.

5. A mold for forming doublel concrete walls, including plank sides Varranged in pairs constituting mold. sectionsto form saidldouble walls, clampingmeans for the several series of planks, said clampingmeans extendingthrough all the planks of both pairs, said clamping means including transverse bolts, and elongated vertically disposed elements on saie bolts and extending along the joints at the inner sides of the respective series ot planks, together' with expansible means between those planks forming the inner sides of the respective mold sections.

6. A mold for termine' double concrete walls, including plank sides arranged in pairs constituting mold sections to term said double walls. strips on the outer faces ot' the outermost planks at the joints thereof, elongated elements extending along the joints of the inner planks, clamp bolts extending transverselyv through said strips and continuously through both mold sections, elongated elements, and planks. and spacers on the bolts between said elements, together with expansible means between those planks forming the inner sides of the respective mold sections.

7. In a mold for concrete walls, spaced planks forming the inner and outer sides ot the mold, transverse clamp bolts tor said planks, elongated elements on said bolts and extending along the joints at the inner taces et the planks, and spacers on the bolts between said elenients,.said planks at 'the joints thereoth having edge cut-outs at the bolts.

A mold for concrete walls presenting planks forming the inner and outer sides o'l" the mold, and corner sockets for the ends of adjacent plank sides. the outer corner elements including members engaging the planks and sustaining said outer corner elements offset outwardly from the adjacent sides et the mold.

9. A mold tor concrete walls comprising planks forming the inner and outer sides of the mold, and corner elements connected with t-he ends of adjacent planks, said corner elements including means for sustaining said corner elements odset from the general planes of the outer adjacent sides; together with an angle piece at the said corner and spaced from the tiret-mentioned corner element to determine the inner surface of the molded wall at the corner.

l0. A mold tor double walls comprising` separated mold sections having plank sides, angular corner sockets for the adjacent ends of the exterior planks. said exterior sockets having angular members at the inner sides of the sockets between which angular members and the outer sides et said exterior sockets the plank ends are accommodated, angle elements overlapping the adjacent ends ot the interior plank sides of each mold section and transverse bolts at right angles to each other and passing through said planks. socket members and angle elements.

11. A mold for double walls comprising separated mold sections having plank sides,

angular corner sockets for the adjacent ends of the exterior planks, said sockets having separate angular inner and outer members between which the ends of the outermost plank sides ot' the double mold are accommodated, angle elements overlapping the adjacent ends of the interior plank sides of each mold section and transverse bolts at right angles to each other and passing through said planks, socket members and angle elements; together with spacing sleeves on the bolt between the plank sides of each section.

1Q. A inold for forming concrete structures of the indicatedtype including separated sections ttor molding separate wall sections, each mold section comprising plank sides, sockets for receiving the adjacent ends oi' the planks, spacing means in the respective mold sections between the sides of the respective sections a core unit and eX- pansible to exert lateral pressure againstthe inner sides of both mold sections between said mold sections and transversev clamp bolts passing joint-lv through the sockets of both mold sections and adapted to hold said mold sections and said unit together as a unitary rigid mold.

13. A mold for concrete structures of the indicated type, including separated mold sections havingplank sides and having sockets presentingseparate inner and outer side walls accommodating the ends of the .planks therebetween. a core between the adjacent planks o't the respective sectionsand expansible to exert lateral pressure against the inner sides of both mold sections, and bolts passing tinnsversel;v through said socket sides et both mold sections, and spacing means between the respective sides of each mold section. the bolts, core and spacing means joint-lj'Y servingr to bind the sockets against the pianks, as well as serving to hold said mold sections and said coi'e together as a rigid unitarjT structure.

)i mold for concrete structures of the indicated type including separated mold sections` and an expansible and collapsible core unit adapted to exert pressure against the sections tending to separate the same; together with external clamp means exerting pressure on said sections and means between the sides of each mold section and resistant ot the Apressure exerted bv said core, and bv said external clamp means to hold the whole together in the form of a nnitarj7 portable mold under said pressure.

15. A. mold for concrete structure having separated mold sections adapted to mold the separate wall sections. said sections having plank sides and sockets :tor the clamp ends, and a plurality ot separate eXpansible and collapsible core units disposed at intervals between said sections together with spacing means between the sides of each section, and

transverse bolts passing through both of saidmold sections at said sockets to cause said sections'to clamp said mold sections and Vcore units together as a rigid unitary mold.

f 16. A mold of the class described comprising inner and outer mold sections, each having separate inner and outerV sides, clamp bolts extending transversely through the both mold sections, spacing elements on said bolts and disposed between the sides of the respective mold sections, the bolts being removable from said clamping elements, an eXpansible core adapted to be disposed between the mold sections and means to eXpand the sides oit the core to press the inner sides of the mold sections against said clamping elements on the bolt.

17. A mold for forming double walls, said mold comprising molding` units for pouring the separate wall sections oit the double wall, and an expansible core unit between said mold units adapted to exert lateral pressure against the inner sides oit both mold sections, each of said mold units constituting a molding assemblage complete in itself independently of said core unit; together with removable means to hold said molding units and said core unit rigidly together to constitute a unitaryv double mold.

18. A mold for forming double walls,said mold comprising separated mold sections for the pouring of the wall sections, those sides ofthe respective mold sections at the interior of the mold being` separate and dis-- connected froin each other, spacing means in the respective sections between the sides oi the respective sections, means to clamp the interior and exterior sides ot each mold section immovably in spaced relation to each other, and a removable expansible core unit accommodated between said interior sidesV and adapted to eXert lateral pressure against gethcr with spacing means in the respective mold sections, between the respective sides thereof, and clamp means extending transversely through the interiorV and exterior side walls of the respective mold sections for exerting clamping pressure on the outer sides ot the mold, to hold said mold sections and said core unit together rigidly assembled as a unitary double mold.

20. A wall inold of the class described comprising inner and outer mold sections, cach having separate inner and outer sides, clamp bolts extending transversely7 through both inold sections and including clamping elements loose on the bolts andA disposed between the sides `of each section to determine the thickness oi the inner and outer valls, and a core adapted to be expanded between the mold sections to exert lateral pressure against the inner sides of both scctions, the elements disposed between the sides and the said expansible core being Vadapted to accommodate themselves to the thickness of the material of the sides, under the clamping pressure.r

HERMAN J. KESTLER Y 

